Some Money related websites

(Disclaimer: inclusion on this list does not constitute an endorsement of the company or contents of these websites. They are provided as examples for education and further research. Consult a financial professional before making investments, setting up a company, or making tax decisions)

Investing, IRAs, money market accounts, retirement accounts
http://finance.yahoo.com
http://vanguard.com
http://etrade.com
http://investopedia.com

For setting up business structures, corporations
Minnesota Secretary of State Office
Click through for various information such as name availability, LLC or other business structures, regulations, processes, and statutes

Income Taxes for Musicians
IRS forms and publications

Accountants who work with artists in MN (via Springboard for the Arts)